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Ashrae 90.1-2010

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You may preview the following ASHRAE Standards & Guidelines with the links below. The link will allow you to viewing access to your selection with the option to purchase your copy with the buy button. If you need technical support, please contact iEngineering at

The performance approach is also used to demonstrate design energy efficiency, often expressed as percent better than ASHRAE Standard 90.1. Building designs will stated their performance as "40% better than ASHRAE 90.1-2007" or "20% better than ASHRAE 90.1-2010". Percent improvement over ASHRAE 90.1 is the basis for awarding energy points within the LEED rating system.

Current status of adoption into energy codes is tracked by the Building Codes Assistance Project. As of September 2020, 7 states have codes which meet or exceed ASHRAE Standard 90.1-2016; 14 states have codes which meet or exceed ASHRAE Standard 90.1-2013; 8 states have codes which meet or exceed ASHRAE Standard 90.1-2010; 9 states have codes which meet or exceed ASHRAE Standard 90.1-2007 and 8 states have either no statewide code or a code which precedes 90.1-2004.[4] The California Energy Code (CCR Title 24 Part 6) has a very similar structure and requirements.

In the 2010 edition of ASHRAE 90.1, many changes were made, including definitions, tables, and sections. Energy savings compared to 90.1-2004 were approximately 25 percent including plug loads and approximately 31 percent excluding plug loads. DOE issued a positive determination and notified states that they should adopt 90.1-2010 or a code that DOE accepts as equivalent by October 2013.

In the 2013 edition several updates were made to the building envelope, lighting and mechanical sections of the standard. With each new edition of ANSI/ASHRAE/IES Standard 90.1, DOE is required by statute[8] to issue a determination as to whether the updated edition will improve energy efficiency in commercial buildings. DOE issued a positive determination stating that Standard 90.1-2013 would achieve greater energy efficiency in buildings subject to that code. Compared to 90.1-2010, 90.1-2013 is expected to save approximately 8.7% in energy cost, 8.5% in source energy and 6.7% in site energy.[9]

Has anyone compared ASHRAE 90.1-2007 vs 90.1-2010 to see, if you get the same points in EAc1 or do you get less points In other words, will it be more difficult to get points in LEEDv4, when 90.1-2010 must be used

As of December 20, 2013 the British Columbia Building Code incorporated a fairly substantial addendum that requires complex buildings (buildings other than housing and small buildings) to conform to either ASHRAE 90.1-2010 or the NECB 2011. Before this addendum, the BCBC referenced only ASHRAE 90.1-2004. The change to the two new alternate compliance paths is intended to reduce energy use, which all would likely agree is commendable. However, it will have an impact on construction requirements.

Many consider Standard 90.1-2010 to be the energy bible. But, whenI'm working with people new to energy modeling, they have questionsabout the energy cost budget method and the performance rating methods foundin the standard. They want to know the differences between them, theirrequirements and when they are used. So, I decided this was the perfect topicfor my first column on energy modeling.

We have determined the energy modeling method used for achievingcompliance with the standard. If we want to rate the energy efficiency ofbuilding designs that exceed the requirements of the standard, we use theperformance rating method (PRM), found in Standard 90.1-2010's NormativeAppendix G. This approach also simulates performance between a proposedbuilding design and a baseline building design. However, instead of verifyingthat the proposed design results are within the range of compliance, theperformance rating method determines a percentage improvement between the twobuildings performances. The PRM is the method used for the whole buildingenergy simulation option of the Energy and Atmosphere Credit 1, OptimizeEnergy Performance, for LEED New Construction & Major Renovations-2009.

Table G3.1 in Standard 90.1-2010 lists the modeling requirementsfor calculating both the proposed building design as well as the baselinebuilding design performance. Table G3.1.1A lists the baseline building HVACsystem types and Table G3.1.1B provides the HVAC system descriptions.

Standard 90.1-2010 sets minimum energy requirements for buildings.Each section contains mandatory provisions that must be met. The standardalso contains two energy modeling methods: the energy cost budget (ECB)method and the performance rating method (PRM).

Previous studies have shown that more electricity is consumed for lighting in commercial buildings than for other applications. With tighter operational budgets and enhanced focus on supporting better environmental outcomes, organizations are committed to changing this. LEED v4 supports this aim by using ASHRAE 90.1-2010: Energy Standard for Buildings Except Low-Rise Residential Buildings as a baseline--an updated standard with an aggressive goal of 30% energy-cost savings over the previous standard. To help give an understanding of possible energy-savings related to lighting controls, Lawrence Berkeley National Laboratory (LBNL) published A Meta-Analysis of Energy Savings from Lighting Controls in Commercial Buildings, an analysis of 240 energy savings estimates from 88 papers and case studies, focusing on actual field installations as opposed to simulations. From this data, LBNL produced the best estimates of average lighting energy savings for four primary lighting control strategies (see Table 1).

In prior versions of LEED, the energy baseline was ASHRAE 90.1-2007. This has now been increased to ASHRAE 90.1-2010. ASHRAE 90.1 is a standard that provides minimum requirements for energy-efficient designs for buildings.

With safe and sustainable construction near the top of the national and global construction agenda, the International Code Council and the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) have collaborated to create a publication with the most innovative energy-efficiency requirements for residential and commercial buildings. This new publication contains both the 2012 International Energy Conservation Code (IECC) and ANSI/ASHRAE/IES Standard 90.1-2010 Energy Standard for Buildings Except Low-Rise Residential Buildings in one volume to help ensure newly built and renovated buildings are in compliance with the latest codes and standards.

The 2012 IECC will be at least 15 percent more energy efficient than the 2009 edition, according to U.S. Department of Energy estimates. The code contains improved requirements for windows, doors, skylights and HVAC systems. The ASHRAE/IES 90.1-2010 has been expanded to include a broader scope, more detailed requirements and changes from more than 100 addenda improving all four of the major building components: envelopes, mechanical systems, lighting systems and service water heating. The significant changes in the two documents remain consistent with the American Recovery and Re-investment Act as required in federal laws.

To purchase a copy of the 2012 International Energy Conservation Code (IECC) and the ANSI/ASHRAE/IES Standard 90.1-2010 Energy Standard for Buildings Except Low-Rise Residential Buildings as one publication, visit

Industry Stands to Benefit from New DOE Determination With the Department of Energy's (DOE) determination that the adoption of ASHRAE 90.1-2010 would reduce energy use by 18.5 percent compared to the 2007 version of the code, the market for high-performance glazing and framing systems looks poised to jump up. In November, DOE officials announced that analysis shows that implementing the 2010 version of Standard 90.1, Energy Standard for Buildings, Except Low-Rise Residential Buildings, will save commercial building owners energy, help them meet sustainability goals and reduce carbon pollution. "The DOE findings are aligned with the current glass and glazing industry trends of working towards more high-performance, energy-efficient products," says Urmilla Jokhu-Sowell, technical director of Glass Association of North America in Topeka, Kan. "The 2010 version of ASHRAE 90.1 incorporates the use of high-performance glass and glazing products and dynamic glazing, and also encourages proper daylighting design." When DOE issues a final determination, states are expected to review the new code provisions and update their building code to meet or exceed the energy efficiency of the new standard within two years.

ANSI/ASHRAE/IES Standard 90.1-2013, Energy Standard for Buildings Except Low-Rise Residential Buildings, incorporates 110 addenda, reflecting changes made through the public review process. Appendix F gives brief descriptions and publication dates of the addenda to 90.1-2010 reflected in this new edition.

The cost of ANSI/ASHRAE/IES Standard 90.1-2013, Energy Standard for Buildings Except Low-Rise Residential Buildings, is 135 ($115, ASHRAE members). To order, contact ASHRAE Customer Contact Center at 1-800-527-4723 (United States and Canada) or 404-636-8400 (worldwide), fax 678-539-2129, or visit 59ce067264


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